RAM is much faster, but also physically larger and more expensive.
Think of RAM like desk space, while an SD card is like a book. The book can’t show you as much information at once, but all the pages in the book could cover the desk many times over.
16GB of RAM isn’t particularly big these days, that’s around $40 of memory. I’d put at least that much in any machine that’s doing more than light web browsing. I have that much memory, and I do run out of it about somewhat frequently.
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